Plate-tightener



F. M. KREKOW.

PLATE 'HGHTENER.

APPLICATION FILED JUNE 2, 1919.

1,822,246. Patented Nov. 18, 1919.

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FRANKLIN M. KREKOW, or TACOMA, WASHINGTON.

PLATE-TIGHTENER.

Application filed June 2, 1919.

To all whom it may concern:

Be it known that I, FRANKLIN M. Kun- KOW, a citizen of the United States, and res1- dent of the city of Tacoma, county of Pierce, State of Washington, have invented certain new and useful Improvments in Plate Tighteners, of which the following is a specification.

My invention relates to a device which is intended to be used in order to draw together plates, as in the work of constructing ships.

The object of my invention is to provide a device which will have sufficient power so that it may be relied upon to powerfully draw together plates which are slightly separated, and thus to enable them to be secured in close contact and in a suitable manner for receiving rivets.

The. features of this device which I deem to be novel and upon which I desire patent protection will be hereinafter defined by the claims.

In the accompanying drawings I have shown my device in the forms of constructions which I prefer to use.

' Figure 1 shows, in perspective, the application of my device in drawing together two p ates.

Fig, 2 is a longitudinal section through the device and the plates.

Fig. 3 is a transverse section taken upon the plane of the bolt.

Fig. 4 is a side view of a slightly modified form of the device, the plates being shown in section.

Fig. 5 is a transverse section through a modified form, the device showing certain features of construction.

In such work as the construction of ships it is necessary to draw the edges of overlapping plates, which are to be secured by rivets, tightly together so as to obtain close surface contact between them prior to the insertion of the rivets. My device is intended for drawing these plates together,

but not to be used as a means for holding the plates as drawn together for any considerable time. By my invention I employ two complemental wedges and with these associate a bolt in such manner that one of the wedges is driven between the other wedge and the plate, in such manner as to place heavy stress upon the bolt.

The principal wedge, or the one which is Specification of Letters Patent.

Patented Nov. 18, 1919.

Serial No. 301,316.

driven, is the larger wedge 1, or as shown in Fig. 4, 1 This wedge has a centrally located slot 10 extending longitudinally thereof. The other wedge 2, 2 in Fig. 4, has a hole 20, extending therethrough, of a size to receive the bolt 3. This hole is preferably somewhat conical in shape with the apex of the cone at the face of the wedge which is outward or away from the companion wedge. This permits a certain amount of rocking action, as between the wedge and the bolt.

In using my device the bolt 3 is pressed through the holes in the plates 4, through the slot in the wedge 1 and hole in the wedge 2. The bolt 3 has a series of key receiving slots 30, extending therethrough, these being spaced at intervals throughout its length. Through the slot which is nearest to the sur face of the wedge 2, is then placeda key or pin 5. The wedge l is then-driven under the wedge 2, and thus exerts a strong pull upon the bolt, tending to draw the plates .4

together. The angle of incline of these wedges may be anything desired.

To prevent possible turning of the wedge 2 upon the wedge 1, I prefer to provide these with complemental surfaces, which, by their engagement, will prevent such turning. As shown in Figs. 2 and 4, this is done by providing the wedge 2 with lugs 21 which enter the slot 10' in the wedge 1. Another way for securing the same result is shown in the modification illustrated in Fig. 5, in which the contact surfaces between the two wedges l and 2 are made concavo-convex, in other words, one of the wedges has a surface which is slightly hollow or trough shape, while the other is slightly ridged.

The under wedge 1 'ma be transversely rounded on its under sur ace, as is shown in Fig. 5, thus insuring an even bearing even upon an uneven surface.

I prefer to provide the ti of the large wedge l with a bevel, as 12, suc that as it contacts with the edge of anotherplate, or other member which not of too great a thickness, it will tend to ride thereupon when driven. Partly to secure this result and partly to make it possible to use this device upon surfaces which are slightl concave, I

may lengthwise curve or roun the under surface of the wedge, as is shown clearly in Figs. 1 and 2.

By means of the above device two plates may be powerfully drawn together and when brought in contact they may be held in contact by the use of an ordinary bolt.

What I claim as my invention is:

1. A device for drawing plates together, comprising a wedge having a slot extending lengthwise thereof and adapted to receive the body of a bolt, a second wedge having a hole for the reception of the same bolt, abolt having a series of key slots extending transversely through it, and a key adapted to enter said slots.

2. A device for drawing plates together comprising a wedge having one side longitudinally curved and having a bolt receiving slot extending lengthwise thereof, a complemental wedge having a hole for the same bolt, a bolt having key receiving slots and a key fitting said slots.

8. A device for drawing plates together comprising a wedge having a longitudinally extending bolt receiving slot, the tip of said wedge being beveled up from its bottom sur face, a complemental wedge having a hole for the same bolt, and a bolt adapted to pass through said wedges.

Signed at Tacoma, Vi alshington, this 21st day of May, 191$).

FRANKLIN M. KREKOVV. 

